This paper describes the application of a radar rainfall forecast model in combination with a hydrodynamic runoff model to predict flows is a sewer system. The results for three events of different type of rainfall are assessed on both the rainfall side and the runoff side with respect to their effectiveness for real time control. A quantification of the forecast error depending on the lead time is done using an error component analysis based on the mean squared error of the areal catchment rainfall. The benefit of flow forecasting is clearly demonstrated.

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